Stator

Abstract

To provide, for example, a stator having a structure that prevents obstruction of a magnetic path.SOLUTION: A stator (1) comprises, for example, a plurality of magnetic substances (100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h, 100i, 100j, 100k) laminated in a predetermined direction and each including a plurality of magnetic pole parts (110) arranged side by side in a circumferential direction, a ring (120), and a plurality of plate-like parts (130) connecting the plurality of magnetic pole parts (110) and the ring (120) to each other. The ring (120) includes an engaging part (121) that extends in the predetermined direction, and a part to be engaged (122) that recesses in a radial direction. The engaging part (121) and the part to be engaged (122) are arranged side by side in the circumferential direction. In the two magnetic substances (100b, 100c) adjacent to each other in the predetermined direction, the engaging part (121) of one magnetic substance (100c) engages with the part to be engaged (122) of the other magnetic substance (100b).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stator. [Background technology]

[0002] A known stator for use in a motor has a core in which magnetic bodies such as silicon steel plates are stacked in a predetermined direction. In such a core, the magnetic bodies are integrated and positioned with one another by crimping or the like. For example, Patent Document 1 discloses a core in which the edges of the magnetic bodies are crimped. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-23537 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of multiple magnetic bodies fixed by crimping, for example, the crimped portion may obstruct the magnetic path, preventing the stator from fully performing its function. An example of an object of the present invention is to provide a stator having a structure that suppresses obstruction of the magnetic path. [Means for solving the problem]

[0005] A stator that is one example of the present invention comprises a plurality of magnetic bodies stacked in a predetermined direction, each of which comprises a plurality of magnetic pole portions aligned in a circumferential direction, a ring, and a plurality of plate-shaped portions connecting the plurality of magnetic pole portions and the ring, the ring comprising an engaging portion extending in the predetermined direction and an engaged portion recessed in the radial direction, the engaging portion and the engaged portion being aligned in the circumferential direction, and of two of the plurality of magnetic bodies that are adjacent in the predetermined direction, the engaging portion of one magnetic body engages with the engaged portion of the other magnetic body. [Brief explanation of the drawings]

[0006] [Figure 1] 1 is a perspective view of a stator according to a first embodiment of the present invention; [Figure 2] 1 is an exploded perspective view of a core of a stator according to a first embodiment of the present invention; [Figure 3] 1 is a perspective view of a first magnetic body of a stator according to a first embodiment of the present invention; [Figure 4] 1 is a perspective view of the second and subsequent magnetic bodies of a stator according to a first embodiment that is an example of the present invention. FIG. [Figure 5] 1 is a perspective view showing a state in which a first magnetic body and a second magnetic body of a stator according to a first embodiment, which is an example of the present invention, are stacked one on top of the other. [Figure 6] FIG. 6 is an enlarged view of a part of FIG. 5. [Figure 7] 3A to 3C are diagrams showing an example of a method for stacking a third magnetic body in a stator according to a first embodiment which is an example of the present invention. [Figure 8] 1 is a perspective view showing a state in which first to third magnetic bodies of a stator according to a first embodiment, which is one example of the present invention, are stacked. FIG. [Figure 9] FIG. 4 is a perspective view of a stator according to a second embodiment of the present invention. [Figure 10] FIG. 4 is an exploded perspective view of a core of a stator according to a second embodiment of the present invention. [Figure 11] FIG. 10 is a perspective view of a first magnetic body of a stator according to a second embodiment of the present invention. [Figure 12] 10A and 10B are diagrams showing an example of a method for stacking first and second magnetic bodies in a stator according to a second embodiment which is an example of the present invention. [Figure 13] FIG. 10 is a diagram showing an example of a method for stacking three magnetic bodies in a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0007] In describing the embodiments of the present invention, for convenience of explanation, the direction along the axis X will be referred to as the "stacking direction." In the stacking direction, the direction of arrow a along the axis X will be referred to as the upper side or one side, and the opposite direction, the direction of arrow b, will be referred to as the lower side or other side. However, in this case, "upper side" and "lower side" have no relation to up and down in the vertical direction. Furthermore, the direction of arrow cd perpendicular to the axis X will be referred to as the radial direction, and in the radial direction, the direction of arrow c away from the axis X will be referred to as the outer side or one side, and the direction of arrow d approaching the axis X will be referred to as the inner side or other side. Furthermore, the direction rotating around the axis X will be referred to as the circumferential direction.

[0008] [First embodiment] A first embodiment of the present invention will be described below with reference to the drawings (FIGS. 1 to 8). FIG. 1 is a perspective view of a stator 1 according to this embodiment. FIG. 2 is an exploded perspective view of a core 100 of the stator 1. FIG. 3 is a perspective view of the first magnetic body (first magnetic body) 100a of the stator 1. FIG. 4 is a perspective view common to the second magnetic body (second magnetic body) 100b to the eleventh magnetic body (eleventh magnetic body) 100k of the stator 1. FIG. 5 is a perspective view showing a state in which the first magnetic body 100a and the second magnetic body 100b of the stator 1 are stacked, and FIG. 6 is an enlarged view of a portion thereof. FIG. 7 is a diagram showing an example of a method for stacking the third magnetic body (third magnetic body) 100c in the stator 1. FIG. 8 is a perspective view showing a state in which the first magnetic body 100a, the second magnetic body 100b, and the third magnetic body 100c of the stator 1 are stacked.

[0009] As shown in Fig. 1, the stator 1 has a core 100 and a coil 10. The stator 1 is a stator for an outer rotor type motor. The core 100 has a plurality of plate-shaped magnetic bodies (first magnetic body 100a to eleventh magnetic body 100k) stacked in a predetermined direction (stacking direction). Each magnetic body is, for example, a silicon steel plate. In this embodiment, the second magnetic body 100b is stacked on one side (in the direction of arrow a; hereinafter referred to as the "upper side") of the first magnetic body 100a, the third magnetic body 100c is stacked on the upper side of the second magnetic body 100b, the fourth magnetic body 100d is stacked on the upper side of the third magnetic body 100c, the fifth magnetic body 100e is stacked on the upper side of the fourth magnetic body 100d, the sixth magnetic body 100f is stacked on the upper side of the fifth magnetic body 100e, the seventh magnetic body 100g is stacked on the upper side of the sixth magnetic body 100f, the eighth magnetic body 100h is stacked on the upper side of the seventh magnetic body 100g, the ninth magnetic body 100i is stacked on the upper side of the eighth magnetic body 100h, the tenth magnetic body 100j is stacked on the upper side of the ninth magnetic body 100i, and the eleventh magnetic body 100k is stacked on the upper side of the tenth magnetic body 100j. In the core 100, the upper surface of the eleventh magnetic body 100k (the first surface Su described later) is exposed to one side in the stacking direction (the direction of arrow a), and the lower surface of the first magnetic body 100a (the second surface Sad described later) is exposed to the other side in the stacking direction (the direction of arrow b).

[0010] The core 100 includes a cylindrical portion 102 having a generally cylindrical shape as a whole, and a plurality of (six in this embodiment) teeth 101 protruding radially outward (in the direction of arrow c) from the cylindrical portion 102. The teeth 101 are arranged at predetermined intervals (equally spaced in this embodiment) every 60° in the circumferential direction. The teeth 101 face a rotor (not shown) of a motor. Each of the teeth 101 is generally T-shaped when viewed from the stacking direction, and its radially outward end (in the direction of arrow c) protrudes to both sides in the circumferential direction. The coil 10 is wound around each of the teeth 101. The core 100 and the coil 10 are insulated from each other by an insulator (not shown) made of an insulating material. Note that while FIG. 1 illustrates the coil 10 wound around only one tooth 101 using imaginary lines, in reality, the coil 10 is wound around all of the teeth 101.

[0011] FIG. 2 is a diagram showing a state in which the multiple magnetic bodies (first magnetic body 100a to eleventh magnetic body 100k) constituting the core 100 are separated one by one in the stacking direction. Of the multiple magnetic bodies, the second magnetic body 100b to eleventh magnetic body 100k each include multiple magnetic pole portions 110 arranged in the circumferential direction, a ring 120 connected to the multiple magnetic pole portions 110, and multiple connecting portions (hereinafter referred to as plate-shaped portions or spokes) 130 connecting the multiple magnetic pole portions 110 and the ring 120. In this embodiment, the multiple magnetic pole portions 110 are located outside the ring 120 in the radial direction (direction of arrow c). The ring 120 includes an engaging portion 121 extending in the stacking direction and an engaged portion 122 recessed in the radial direction on the opposite side to the magnetic pole portions 110 (inside in the radial direction in this embodiment).

[0012] In this embodiment, all of the magnetic bodies constituting the core 100 have the same shape, except for the first magnetic body 100a, which is located at the bottom in the stacking direction (in the direction of arrow b). Focusing on one magnetic body (for example, the eleventh magnetic body 100k, which is most easily visible in FIG. 2), the ring 120 has a plurality of (three in this embodiment) engaging portions 121 and a plurality of (three in this embodiment) engaged portions 122. The three engaging portions 121 are arranged at predetermined intervals (equal intervals in this embodiment) in the circumferential direction, and the angle between two adjacent engaging portions 121 is 120°. Similarly, the three engaged portions 122 are arranged at predetermined intervals (equal intervals in this embodiment) in the circumferential direction, and the angle between two adjacent engaged portions 122 is 120°. In the circumferential direction, one engaged portion 122 is disposed at the same angle (60°) from two adjacent engaging portions 121. That is, in the circumferential direction, the engaging portions 121 and the engaged portions 122 are disposed alternately, spaced 60° apart.

[0013] Of the multiple magnetic bodies constituting the core 100, two adjacent magnetic bodies in the stacking direction are overlapped with a 60° offset around the axis X. Of the two magnetic bodies adjacent in the stacking direction, the engaging portion 121 of one magnetic body and the engaged portion 122 of the other magnetic body are positioned circumferentially overlapping. Therefore, of the two magnetic bodies adjacent in the stacking direction, the engaging portion 121 of one magnetic body engages with the engaged portion 122 of the other magnetic body. Specifically, where n is an integer of 1 or more, the engaging portion 121 of the (n+1)th magnetic body counting from the bottom in the stacking direction (the direction of arrow b) engages with the engaged portion 122 (or the engaged portion 122a described later) of the nth magnetic body. Specific configuration examples of the engaging portion 121 and the engaged portions 122, 122a will be described later.

[0014] Specific configurations of the magnetic bodies and examples of lamination methods will be described in detail below with reference to FIGS. 3 to 8 as appropriate.

[0015] (first magnetic body) 3 is a perspective view of the first magnetic body 100a. The first magnetic body 100a is the magnetic body arranged at the bottom in the stacking direction (direction of arrow b). In this embodiment, the first magnetic body 100a has a slightly different shape from the other magnetic bodies (the second magnetic body 100b to the eleventh magnetic body 100k).

[0016] The first magnetic body 100a includes a plurality of (six in this embodiment) magnetic pole portions 110a arranged in the circumferential direction, a ring 120a connected to the plurality of magnetic pole portions 110a, and a plurality of plate-like portions 130a connecting the plurality of magnetic pole portions 110a and the ring 120a. In the radial direction, the plurality of magnetic pole portions 110a are located outside the ring 120a (in the direction of arrow c). The ring 120a is a substantially annular portion having an inner circumferential portion 120ai and an outer circumferential portion 120ao. The inner circumferential portion 120ai is the edge portion on the inner side in the radial direction of the ring 120a (in the direction of arrow d), and the outer circumferential portion 120ao is the edge portion on the outer side in the radial direction of the ring 120a (in the direction of arrow c).

[0017] In the radial direction, the plurality of plate-shaped portions 130a are connected to the outer periphery 120ao of the ring 120a. Each plate-shaped portion 130a has a rectangular or approximately rectangular shape and protrudes radially outward (in the direction of arrow c) from the ring 120a. In this embodiment, six plate-shaped portions 130a are arranged in the circumferential direction at predetermined intervals (equal intervals in this embodiment) every 60°. The magnetic pole portion 110a is connected to the end of the plate-shaped portion 130a on the radially outer side (in the direction of arrow c) and has a larger dimension in the circumferential direction than the plate-shaped portion 130a. The end of the magnetic pole portion 110a on the radially outer side (in the direction of arrow c) is arc-shaped. The plate-shaped portion 130a and the magnetic pole portion 110a are integrally formed in a substantially T-shape when viewed from the stacking direction, and the end on the radially outer side (in the direction of arrow c) protrudes to both sides in the circumferential direction. The plate-shaped portions 130a and the magnetic pole portions 110a form part of the teeth 101 of the core 100. The plate-shaped portions 130a and the magnetic pole portions 110a are arranged in rotational symmetry (i.e., six-fold symmetry) such that when the first magnetic body 100a is rotated 60° around the axis X, the plate-shaped portions 130a and the magnetic pole portions 110a overlap with adjacent plate-shaped portions 130a and magnetic pole portions 110a.

[0018] The ring 120a is provided with a rectangular or substantially rectangular recess (hereinafter referred to as a notch) 121a recessed in the radial direction on the side opposite the magnetic pole portion 110a (i.e., on the inner peripheral portion 120ai in this embodiment), a rectangular or substantially rectangular recess (hereinafter referred to as an engaged portion) 122a recessed in the radial direction, and a semicircular or substantially semicircular recess 123a recessed in the radial direction. In this embodiment, the notch 121a, the engaged portion 122a, and the recess 123a are all recessed outward in the radial direction (in the direction of arrow c). However, the first magnetic body 100a may have a circular inner peripheral portion that is continuous in the circumferential direction.

[0019] The notches 121a are formed in a shape such that the circumferential dimension is larger than the radial dimension. However, the notches 121a may be formed in a shape such that the circumferential dimension is smaller than the radial dimension. A plurality of notches 121a (three in this embodiment) are formed in the ring 120a. The three notches 121a are arranged at predetermined intervals (equidistant in this embodiment) in the circumferential direction, and the angle between two adjacent notches 121a is 120°. The notches 121a are arranged in rotational symmetry (i.e., three-fold symmetry) such that when the first magnetic body 100a is rotated 120° around the axis X, each notch 121a overlaps with an adjacent notch 121a.

[0020] The engaged portions 122a are formed in a shape whose circumferential dimension is larger than their radial dimension. However, the engaged portions 122a may be formed in a shape whose circumferential dimension is smaller than their radial dimension. The circumferential dimension of the engaged portions 122a is smaller than the circumferential dimension of the notches 121a. However, the circumferential dimension of the engaged portions 122a may be larger than the circumferential dimension of the notches 121a. A plurality of engaged portions 122a (three in this embodiment) are formed on the ring 120a. The three engaged portions 122a are lined up at predetermined intervals (equally spaced in this embodiment) in the circumferential direction, and the angle between two adjacent engaged portions 122a is 120°. The engaged portions 122a are arranged in rotational symmetry (ie, three-fold symmetry) such that when the first magnetic body 100a is rotated 120° around the axis X, each engaged portion 122a overlaps with another adjacent engaged portion 122a.

[0021] The recesses 123a are formed in a semicircular or approximately semicircular shape. The recesses 123a may be formed in other shapes, such as a square or a triangle. A plurality of recesses 123a (six in this embodiment) are formed in the ring 120a. The six recesses 123a are arranged at predetermined intervals (equally spaced in this embodiment) in the circumferential direction, and the angle between two adjacent recesses 123a is 60°. The recesses 123a are arranged in rotational symmetry (i.e., six-fold symmetry) such that when the first magnetic body 100a is rotated 60° around the axis X, each recess 123a overlaps with an adjacent recess 123a.

[0022] In the circumferential direction, one engaged portion 122a is disposed at the same angle (60°) from two adjacent notches 121a. That is, in the circumferential direction, the notches 121a and the engaged portions 122a are disposed alternately, spaced 60° apart. The recesses 123a are disposed between the notches 121a and the engaged portions 122a such that the angle therebetween is 30°. As described above, the first magnetic body 100a as a whole has a rotationally symmetric (i.e., three-fold symmetric) shape that overlaps when rotated 120° around the axis X.

[0023] The first magnetic body 100a has a first surface Sau and a second surface Sad. The first surface Sau is the surface on the upper side (arrow a direction) in the stacking direction, and the second surface Sad is the surface on the lower side (arrow b direction) in the stacking direction. The second surface Sad of the first magnetic body 100a is the surface of the core 100 exposed on the other side in the stacking direction (arrow b direction). Both the first surface Sau and the second surface Sad of the first magnetic body 100a are flat surfaces. In this embodiment, all parts of the first magnetic body 100a are above the second surface Sad (arrow a direction). Therefore, when the first magnetic body 100a is placed on a flat surface, the second surface Sad is in surface contact with the flat surface. Furthermore, in this embodiment, all parts of the first magnetic body 100a are below the first surface Sau (arrow b direction).

[0024] (2nd to 11th magnetic bodies) 4 is a perspective view common to the second magnetic body 100b to the eleventh magnetic body 100k. In this embodiment, the second magnetic body 100b to the eleventh magnetic body 100k all have the same shape and dimensions.

[0025] The second magnetic body 100b to the eleventh magnetic body 100k each include a plurality of (six in this embodiment) magnetic pole portions 110 arranged in the circumferential direction, a ring 120 connected to the plurality of magnetic pole portions 110, and a plurality of plate-like portions 130 connecting the plurality of magnetic pole portions 110 and the ring 120. In the radial direction, the plurality of magnetic pole portions 110 are located outside the ring 120 (in the direction of arrow c). The ring 120 is a substantially annular portion having an inner circumferential portion 120i and an outer circumferential portion 120o. The inner circumferential portion 120i is the edge portion on the inner side in the radial direction of the ring 120 (in the direction of arrow d), and the outer circumferential portion 120o is the edge portion on the outer side in the radial direction of the ring 120 (in the direction of arrow c). The magnetic pole portions 110 and plate-like portions 130 of the second magnetic body 100b to the eleventh magnetic body 100k have the same shape, dimensions, and arrangement as the magnetic pole portions 110a and plate-like portions 130a of the first magnetic body 100a, respectively. The second magnetic body 100b to the eleventh magnetic body 100k differ from the first magnetic body 100a in that the shape of the ring 120 is different from that of the ring 120a.

[0026] The ring 120 is formed with an engaging portion 121 extending in the stacking direction on the side opposite to the magnetic pole portion 110 (i.e., on the inner circumferential portion 120i in this embodiment), an engaged portion 122 having a rectangular or approximately rectangular shape and recessed in the radial direction, and a recess 123 having a semicircular or approximately semicircular shape and recessed in the radial direction. In this embodiment, the engaged portion 122 and the recess 123 are all recessed outward in the radial direction (in the direction of arrow c). However, the second magnetic body 100b to the eleventh magnetic body 100k may not have the recess 123. The engaged portion 122 and the recess 123 have the same shape, dimensions, and arrangement as the engaged portion 122a and the recess 123a of the first magnetic body 100a.

[0027] The engagement portion 121 is composed of a recess (hereinafter referred to as a notch) 121p, a protrusion 121q, and a plate portion 121r (see also FIG. 6). The notch 121p is a rectangular or approximately rectangular recess that is recessed radially outward (in the direction of arrow c). The notch 121p is formed in a shape whose circumferential dimension is larger than its radial dimension. However, the notch 121p may be formed in a shape whose circumferential dimension is smaller than its radial dimension. The protrusion 121q is an approximately rectangular portion that protrudes and extends radially inward (in the direction of arrow d) from the end of the notch 121p on the radially outer side (in the direction of arrow c). In the circumferential direction, the protrusion 121q is located at the center of the notch 121p. In the circumferential direction, the dimension of the protrusion 121q is smaller than the dimension of the notch 121p. The dimension of the protrusion 121q in the radial direction is smaller than the dimension of the notch 121p. That is, the protrusion 121q extends radially outward beyond the inner periphery 120i.

[0028] The plate portion 121r is a generally rectangular portion extending downward in the stacking direction (in the direction of arrow b) from the protruding portion 121q. The dimension of the plate portion 121r in the circumferential direction is the same as or approximately the same as the dimension of the protruding portion 121q. Furthermore, the dimension of the plate portion 121r in the circumferential direction is the same as or approximately the same as the dimension of the engaged portion 122. In the stacking direction, the dimension of the plate portion 121r is the same as or smaller than the thickness of the magnetic body adjacent to it on the lower side (in the direction of arrow b). In this embodiment, all the magnetic bodies (the first magnetic body 100a to the eleventh magnetic body 100k) have the same thickness, so the dimension of the plate portion 121r in the stacking direction is the same as or smaller than the individual thicknesses of the first magnetic body 100a to the eleventh magnetic body 100k.

[0029] A plurality of (three in this embodiment) engaging portions 121 are formed on the ring 120. The three engaging portions 121 are arranged at predetermined intervals (equidistant intervals in this embodiment) in the circumferential direction, and the angle formed between two adjacent engaging portions 121 is 120°. The engaging portions 121 are arranged in rotational symmetry (i.e., three-fold symmetry) such that when the second magnetic body 100b to the eleventh magnetic body 100k are rotated 120° around the axis X, each engaging portion 121 overlaps with an adjacent other engaging portion 121.

[0030] In the circumferential direction, one engaged portion 122 is disposed at the same angle (60°) from two adjacent engaging portions 121. That is, in the circumferential direction, the engaging portions 121 and the engaged portions 122 are disposed alternately, spaced 60° apart. The recesses 123 are disposed between the engaging portions 121 and the engaged portions 122 so that the angle therebetween is 30°. As a result, the second magnetic body 100b to the eleventh magnetic body 100k as a whole have a rotationally symmetric (i.e., three-fold symmetric) shape that overlaps when rotated 120° around the axis X.

[0031] Each of the second magnetic body 100b to the eleventh magnetic body 100k has a first surface Su and a second surface Sd. The first surface Su is the surface on the upper side in the stacking direction (the direction of arrow a), and the second surface Sd is the surface on the lower side in the stacking direction (the direction of arrow b). In each of the second magnetic body 100b to the eleventh magnetic body 100k, the plate portion 121r of the engagement portion 121 extends and protrudes downward in the stacking direction (the direction of arrow b) beyond the second surface Sd.

[0032] (Lamination of first and second magnetic bodies) Next, a method for stacking the first magnetic body 100a and the second magnetic body 100b will be described with reference to Fig. 5 and Fig. 6. Fig. 5 is a perspective view showing the state in which the first magnetic body 100a and the second magnetic body 100b are stacked, and Fig. 6 is an enlarged view of a portion thereof.

[0033] The first magnetic body 100a and the second magnetic body 100b are stacked so that the first surface Sau of the first magnetic body 100a contacts the second surface Sd of the second magnetic body 100b. The first magnetic body 100a and the second magnetic body 100b are stacked so that all of the recesses 123a of the first magnetic body 100a are aligned with all of the recesses 123 of the second magnetic body 100b. At this time, in the stacking direction, the engaging portions 121 of the second magnetic body 100b are overlapped with the engaged portions 122a of the first magnetic body 100a, and the engaged portions 122 of the second magnetic body 100b are overlapped with the notches 121a of the first magnetic body 100a. As a result, the engaging portions 121 of the second magnetic body 100b engage with the engaged portions 122a of the first magnetic body 100a. The magnetic pole portion 110a and the plate-shaped portion 130a of the first magnetic body 100a overlap the magnetic pole portion 110 and the plate-shaped portion 130 of the second magnetic body 100b, respectively, and form part of the teeth 101 of the core 100.

[0034] 6 shows an enlarged view of the region where the engaging portion 121 of the second magnetic body 100b engages with the engaged portion 122a of the first magnetic body 100a. The plate portion 121r of the engaging portion 121 of the second magnetic body 100b is sandwiched from both sides in the circumferential direction by the engaged portion 122a of the first magnetic body 100a. That is, the plate portion 121r of the engaging portion 121 of the second magnetic body 100b is press-fitted or inserted into the engaged portion 122a of the first magnetic body 100a downward in the stacking direction (in the direction of arrow b). As a result, the second magnetic body 100b is integrated with the first magnetic body 100a in a state where rotation around the axis X relative to the first magnetic body 100a is restricted. In the stacking direction, the protruding dimension of the plate portion 121r is the same as or smaller than the thickness of the first magnetic body 100a, so even after stacking, all parts of the core 100 are above the second surface Sad of the first magnetic body 100a (in the direction of arrow a).

[0035] (Lamination of third magnetic material) Next, a method for stacking the third magnetic body 100c on the already stacked first magnetic body 100a and second magnetic body 100b will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is a diagram showing an example of a method for stacking the third magnetic body 100c, and Fig. 8 is a perspective view showing the state in which the first magnetic body 100a, the second magnetic body 100b, and the third magnetic body 100c are stacked.

[0036] The third magnetic body 100c is stacked so that the first surface Su of the second magnetic body 100b contacts the second surface Sd of the third magnetic body 100c. The third magnetic body 100c is stacked so that all of the recesses 123a of the first magnetic body 100a and all of the recesses 123 of the second magnetic body 100b are aligned with all of the recesses 123 of the third magnetic body 100c. At this time, in the stacking direction, the engaging portions 121 of the third magnetic body 100c are aligned with the engaged portions 122 of the second magnetic body 100b, and the engaged portions 122 of the third magnetic body 100c are aligned with the engaging portions 121 of the second magnetic body 100b. In other words, the third magnetic body 100c is stacked with respect to the second magnetic body 100b, rotated 60° around the axis X. As a result, the engaging portion 121 of the third magnetic body 100c engages with the engaged portion 122 of the second magnetic body 100b. The magnetic pole portion 110 and the plate-shaped portion 130 of the second magnetic body 100b overlap with the magnetic pole portion 110 and the plate-shaped portion 130 of the third magnetic body 100c, respectively, and form part of the teeth 101 of the core 100.

[0037] The plate portion 121r of the engaging portion 121 of the third magnetic body 100c is sandwiched from both sides in the circumferential direction by the engaged portion 122 of the second magnetic body 100b. That is, the plate portion 121r of the engaging portion 121 of the third magnetic body 100c is press-fitted or inserted into the engaged portion 122 of the second magnetic body 100b downward in the stacking direction (direction of arrow b). As a result, the third magnetic body 100c is integrated with the first magnetic body 100a and the second magnetic body 100b in a state where rotation around the axis X relative to the first magnetic body 100a and the second magnetic body 100b is restricted.

[0038] (Lamination of the fourth magnetic body and subsequent layers) Thereafter, in the same manner, the fourth magnetic body 100d to the eleventh magnetic body 100k are stacked in order while being rotated by 60° around the axis X. Specifically, where n is an integer greater than or equal to 1, the magnetic bodies are stacked so that the engaging portion 121 of the (n+1)th magnetic body counting from the bottom in the stacking direction (the direction of arrow b) engages with the engaged portion 122 of the nth magnetic body (FIG. 2). As a result, all the magnetic bodies are integrated into the core 100 in a state where their rotation around the axis X relative to each other is restricted. The ring 120a of the first magnetic body 100a overlaps with the rings 120 of the second magnetic body 100b to the eleventh magnetic body 100k, forming the cylindrical portion 102 of the core 100. The magnetic pole portion 110a and the plate-shaped portion 130a of the first magnetic body 100a overlap with the magnetic pole portions 110 and the plate-shaped portions 130 of the second magnetic body 100b to the eleventh magnetic body 100k, forming teeth 101 of the core 100. The stator 1 is completed by winding an electric wire around each tooth 101 via an insulator to form a coil 10 (FIG. 1).

[0039] The core 100 of the stator 1 is integrated by engaging the engaging portion 121 of one magnetic body with the engaged portion 122, 122a of another magnetic body adjacent to the lower side in the stacking direction (in the direction of arrow b). The engaging portion 121 and the engaged portion 122 are formed on the edge portion (in the present embodiment, the inner peripheral portion 120ai) on the radial side away from the magnetic pole portion 110. Therefore, compared to a structure in which multiple magnetic bodies are integrated by providing crimped portions on the plate-like portions 130, 130a, for example, stress distortion is suppressed and magnetic flux saturation due to magnetic path obstruction is less likely to occur. Therefore, for example, it is possible to design a core with narrower teeth and a larger space for winding a coil.

[0040] The core 100 of the stator 1 is constructed by stacking multiple magnetic bodies, each having engaging portions 121 and engaged portions 122 arranged alternately at equal intervals in the circumferential direction, while rotating them by a fixed angle. Therefore, it is sufficient to prepare multiple magnetic bodies of the same shape and dimensions in addition to the first magnetic body (first magnetic body 100a), making manufacturing easy.

[0041] Additionally, in this embodiment, the protruding dimension of the plate portion 121r of the engaging portion 121 of the ring 120 of the second magnetic body 100b in the stacking direction is equal to or smaller than the thickness of the first magnetic body 100a, so that even after stacking, all of the core 100 is above (in the direction of arrow a) the second surface Sad of the first magnetic body 100a. Therefore, the end face of the core 100 on the lower side in the stacking direction (in the direction of arrow b) is flat, and is in surface contact when placed on a flat surface, allowing for stable placement.

[0042] Furthermore, each magnetic body has recesses 123, 123a of the same shape formed at predetermined intervals (equally spaced in the present embodiment) in the circumferential direction, so that when they are stacked to form core 100, these recesses 123, 123a are connected to form semi-cylindrical grooves 123G ( FIG. 1 ) extending in the stacking direction. When winding the electric wire to form coil 10, grooves 123G can be used, for example, as positioning portions for fixing a jig.

[0043] [Second embodiment] A second embodiment, which is an example of the present invention, will be described below with reference to the drawings (FIGS. 9 to 12). FIG. 9 is a perspective view of a stator 2 according to this embodiment. FIG. 10 is an exploded perspective view of a core 200 of the stator 2. FIG. 11 is a perspective view of a first magnetic body (first magnetic body 200a) of the stator 2. FIG. 12 is a diagram showing an example of a method for stacking the first magnetic body 200a and the second magnetic body (second magnetic body 200b) in the stator 2. The core 200 has a similar configuration to the core 100 of the first embodiment, except that it includes teeth 201 instead of the teeth 101. Hereinafter, members and parts having the same functions and configurations as the core 100 according to the first embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.

[0044] As shown in Fig. 9, the stator 2 has a core 200 and a coil 10. The stator 2 is a stator for an outer rotor type motor. The core 200 has a plurality of plate-shaped magnetic bodies (first magnetic body 200a to eleventh magnetic body 200k) stacked in a predetermined direction (stacking direction). Each magnetic body is, for example, a silicon steel plate. In this embodiment, in the stacking direction, the second magnetic body 200b is stacked on the upper side of the first magnetic body 200a, the third magnetic body 200c is stacked on the upper side of the second magnetic body 200b, the fourth magnetic body 200d is stacked on the upper side of the third magnetic body 200c, the fifth magnetic body 200e is stacked on the upper side of the fourth magnetic body 200d, the sixth magnetic body 200f is stacked on the upper side of the fifth magnetic body 200e, the seventh magnetic body 200g is stacked on the upper side of the sixth magnetic body 200f, the eighth magnetic body 200h is stacked on the upper side of the seventh magnetic body 200g, the ninth magnetic body 200i is stacked on the upper side of the eighth magnetic body 200h, the tenth magnetic body 200j is stacked on the upper side of the ninth magnetic body 200i, and the eleventh magnetic body 200k is stacked on the upper side of the tenth magnetic body 200j. In the core 200, the upper surface of the eleventh magnetic body 200k (the first surface Su described later) is exposed to one side in the stacking direction (the direction of arrow a), and the lower surface of the first magnetic body 200a (the second surface Sad described later) is exposed to the other side in the stacking direction (the direction of arrow b).

[0045] The core 200 includes a tubular portion 102 that is generally cylindrical overall, and a plurality of teeth 201 (six in this embodiment) that protrude radially outward (in the direction of arrow c) from the tubular portion 102. The teeth 201 are arranged at predetermined intervals (equally spaced in this embodiment) every 60° in the circumferential direction. The teeth 201 face a rotor (not shown) of a motor. Each of the teeth 201 is generally T-shaped when viewed from the stacking direction, and has a shape that protrudes to both sides in the circumferential direction at the ends that are radially outward (in the direction of arrow c).

[0046] 10 is a diagram showing a state in which the multiple magnetic bodies (first magnetic body 200a to eleventh magnetic body 200k) constituting the core 200 are separated one by one in the stacking direction. Of the multiple magnetic bodies, the second magnetic body 200b to eleventh magnetic body 200k each include multiple magnetic pole portions 210 (first magnetic pole portion 210A and second magnetic pole portion 210B) lined up in the circumferential direction, a ring 120 connected to the multiple magnetic pole portions 210, and multiple plate-shaped portions 130 connecting the multiple magnetic pole portions 210 and the ring 120.

[0047] The ring 120 and the plurality of plate-shaped portions 130 of the second magnetic body 200b to the eleventh magnetic body 200k are the same as the ring 120 and the plurality of plate-shaped portions 130 of the second magnetic body 100b to the eleventh magnetic body 100k constituting the core 100 according to the first embodiment, and therefore detailed description thereof will be omitted. The plurality of magnetic pole portions 210 of the second magnetic body 200b to the eleventh magnetic body 200k differ from the plurality of magnetic pole portions 110 of the second magnetic body 100b to the eleventh magnetic body 100k constituting the core 100 according to the first embodiment in that they include an engaging portion 211 or an engaged portion 212, but are otherwise the same.

[0048] As with the core 100 according to the first embodiment, two adjacent magnetic bodies in the stacking direction among the multiple magnetic bodies constituting the core 200 are overlapped with a 60° offset around the axis X. Of the two magnetic bodies adjacent in the stacking direction, the engaging portion 121 of one magnetic body and the engaged portion 122 of the other magnetic body are positioned circumferentially overlapping. Therefore, of the two magnetic bodies adjacent in the stacking direction, the engaging portion 121 of one magnetic body engages with the engaged portion 122 of the other magnetic body. Specifically, where n is an integer of 1 or more, the engaging portion 121 of the (n+1)th magnetic body counting from the bottom in the stacking direction (the direction of arrow b) engages with the engaged portion 122 (or the engaged portion 122a described below) of the nth magnetic body. Additionally, in the core 200 according to the present embodiment, of two magnetic bodies adjacent in the stacking direction, the engaging portion 211 of the first magnetic pole portion 210A of one magnetic body engages with the engaged portion 212 of the second magnetic pole portion 210B of the other magnetic body. Specifically, where n is an integer of 1 or more, the engaging portion 211 of the first magnetic pole portion 210A of the (n+1)th magnetic body counting from the bottom in the stacking direction (the direction of arrow b) engages with the engaged portion 212 (or the engaged portion 212a described later) of the second magnetic pole portion 210B (or the second magnetic pole portion 210Ba described later) of the nth magnetic body.

[0049] Specific configurations of the magnetic bodies and examples of lamination methods will be described in detail below with reference to FIGS. 11 and 12 as needed.

[0050] 11 is a perspective view of the first magnetic body 200a. The first magnetic body 200a is the magnetic body arranged at the bottom in the stacking direction (the direction of arrow b). In this embodiment, the first magnetic body 200a has a slightly different shape from the other magnetic bodies (the second magnetic body 200b to the eleventh magnetic body 200k).

[0051] The first magnetic body 200a includes a plurality of (six in this embodiment) magnetic pole portions 210a (first magnetic pole portion 210Aa and second magnetic pole portion 210Ba) arranged in the circumferential direction, a ring 120a connected to the plurality of magnetic pole portions 210a, and a plurality of plate-shaped portions 130a connecting the plurality of magnetic pole portions 210a and the ring 120a. The ring 120a and the plurality of plate-shaped portions 130a of the first magnetic body 200a are the same as the ring 120a and the plurality of plate-shaped portions 130a of the first magnetic body 100a constituting the core 100 according to the first embodiment, and therefore detailed description thereof will be omitted. The multiple magnetic pole portions 210a of the first magnetic body 200a differ from the magnetic pole portions 110a of the first magnetic body 100a constituting the core 100 in the first embodiment in that the first magnetic pole portion 210Aa has a notch 211a and the second magnetic pole portion 210Ba has an engaged portion 212a, but are otherwise identical.

[0052] The magnetic pole portion 210a is a portion connected to the end of the plate-shaped portion 130a on the outer side in the radial direction (in the direction of arrow c), and has a larger circumferential dimension than the plate-shaped portion 130a. The multiple magnetic pole portions 210a include multiple (three in this embodiment) first magnetic pole portions 210Aa and multiple (three in this embodiment) second magnetic pole portions 210Ba. The first magnetic pole portions 210Aa and the second magnetic pole portions 210Ba have the same shape except for the notches 211a and the engaged portions 212a. The first magnetic pole portion 210Aa is connected to one of two circumferentially adjacent plate-shaped portions 130a, and the second magnetic pole portion 210Ba is connected to the other. Therefore, the first magnetic pole portions 210Aa and the second magnetic pole portions 210Ba are arranged alternately at predetermined intervals (equal intervals in this embodiment) in the circumferential direction. The first magnetic pole portion 210Aa and the second magnetic pole portion 210Ba are arranged at intervals of 120°. The interval between adjacent first magnetic pole portion 210Aa and second magnetic pole portion 210Ba is 60°.

[0053] In this embodiment, the first magnetic pole portion 210Aa is disposed radially outward (in the direction of arrow c) from a portion of the ring 120a where the notch 121a is formed, and the second magnetic pole portion 210Ba is disposed radially outward (in the direction of arrow c) from a portion of the ring 120a where the engaged portion 122a is formed. However, the second magnetic pole portion 210Ba may be disposed radially outward (in the direction of arrow c) from a portion of the ring 120a where the notch 121a is formed, and the first magnetic pole portion 210Aa may be disposed radially outward (in the direction of arrow c) from a portion of the ring 120a where the engaged portion 122a is formed, or the circumferential arrangement of the notch 121a and the engaged portion 122a of the ring 120a and the arrangement of the first magnetic pole portion 210Aa and the second magnetic pole portion 210Ba may be shifted from each other by a predetermined angle in the circumferential direction.

[0054] Each first magnetic pole portion 210Aa has two rectangular or substantially rectangular notches 211a. However, the number of notches 211a formed in each first magnetic pole portion 210Aa may be one, three, four or more. In this embodiment, the notches 211a are formed symmetrically on the radially inner side (direction of arrow d) of the first magnetic pole portion 210Aa, one on each side in the circumferential direction of the connection portion with the plate-shaped portion 130a. In the first magnetic pole portion 210Aa, the notches 211a are disposed away from the connection portion with the plate-shaped portion 130a. The notches 211a are formed in a shape whose circumferential dimension is larger than its radial dimension. However, the notches 211a may also be formed in a shape whose circumferential dimension is smaller than its radial dimension.

[0055] Each second magnetic pole portion 210Ba is formed with two rectangular or approximately rectangular engaged portions 212a. However, the number of engaged portions 212a formed on each second magnetic pole portion 210Ba may be one, three, four, or more. In this embodiment, the engaged portions 212a are formed symmetrically on the radially inner side (direction of arrow d) of the second magnetic pole portion 210Ba, one on each side in the circumferential direction of the connection portion with the plate-shaped portion 130a. In the second magnetic pole portion 210Ba, the engaged portions 212a are disposed away from the connection portion with the plate-shaped portion 130a. The engaged portions 212a are formed with a shape whose circumferential dimension is larger than its radial dimension. However, the engaged portions 212a may be formed with a shape whose circumferential dimension is smaller than its radial dimension. The circumferential dimension of the engaged portions 212a is smaller than the circumferential dimension of the notches 211a. However, the circumferential dimension of the engaged portion 212a may be larger than the circumferential dimension of the notch 211a.

[0056] The first magnetic body 200a has a first surface Sau and a second surface Sad. The first surface Sau is the surface on the upper side (arrow a direction) in the stacking direction, and the second surface Sad is the surface on the lower side (arrow b direction) in the stacking direction. The second surface Sad of the first magnetic body 200a is the surface of the core 200 exposed on the other side in the stacking direction (arrow b direction). Both the first surface Sau and the second surface Sad of the first magnetic body 200a are flat surfaces. In this embodiment, all parts of the first magnetic body 200a are above the second surface Sad (arrow a direction). Therefore, when the first magnetic body 200a is placed on a flat surface, the second surface Sad is in surface contact with the flat surface. Furthermore, in this embodiment, all parts of the first magnetic body 200a are below the first surface Sau (arrow b direction).

[0057] 12 is a diagram showing an example of a method for stacking the first magnetic body 200a and the second magnetic body (second magnetic body 200b) in the stator 2. In this embodiment, the second magnetic body 200b to the eleventh magnetic body 200k all have the same shape and dimensions, so only the second magnetic body 200b will be described in detail below with reference to FIG.

[0058] The second magnetic body 200b includes a plurality of (six in this embodiment) magnetic pole portions 210 (first magnetic pole portion 210A and second magnetic pole portion 210B) arranged in the circumferential direction, a ring 120 connected to the plurality of magnetic pole portions 210, and a plurality of plate-shaped portions 130 connecting the plurality of magnetic pole portions 210 and the ring 120. The ring 120 and the plurality of plate-shaped portions 130 of the second magnetic body 200b are the same as the ring 120 and the plurality of plate-shaped portions 130 of the second magnetic body 100b constituting the core 100 according to the first embodiment, and therefore detailed description thereof will be omitted. The multiple magnetic pole portions 210 of the second magnetic body 200b differ from the magnetic pole portions 110 of the second magnetic body 100b constituting the core 100 in the first embodiment in that the first magnetic pole portion 210A has an engaging portion 211 and the second magnetic pole portion 210B has an engaged portion 212, but are otherwise identical.

[0059] The magnetic pole portion 210 is a portion connected to the end of the plate-shaped portion 130 on the outer side in the radial direction (in the direction of arrow c), and has a larger circumferential dimension than the plate-shaped portion 130. The multiple magnetic pole portions 210 include multiple (three in this embodiment) first magnetic pole portions 210A and multiple (three in this embodiment) second magnetic pole portions 210B. The first magnetic pole portions 210A and the second magnetic pole portions 210B have the same shape except for the engaging portions 211 and the engaged portions 212. The first magnetic pole portion 210A is connected to one of two circumferentially adjacent plate-shaped portions 130, and the second magnetic pole portion 210B is connected to the other. Therefore, the first magnetic pole portions 210A and the second magnetic pole portions 210B are arranged alternately at predetermined intervals (equal intervals in this embodiment) in the circumferential direction. The first magnetic pole portions 210A and the second magnetic pole portions 210B are arranged at intervals of 120°. The interval between adjacent first magnetic pole portions 210A and second magnetic pole portions 210B is 60°.

[0060] In this embodiment, the first magnetic pole portion 210A is disposed radially outward (in the direction of arrow c) from a portion of the ring 120 where the engaging portion 121 is formed, and the second magnetic pole portion 210B is disposed radially outward (in the direction of arrow c) from a portion of the ring 120 where the engaged portion 122 is formed. However, the second magnetic pole portion 210B may be disposed radially outward (in the direction of arrow c) from a portion of the ring 120 where the engaging portion 121 is formed, and the first magnetic pole portion 210A may be disposed radially outward (in the direction of arrow c) from a portion of the ring 120 where the engaged portion 122 is formed, or the circumferential arrangement of the engaging portion 121 and the engaged portion 122 of the ring 120 and the arrangement of the first magnetic pole portion 210A and the second magnetic pole portion 210B may be shifted from each other by a predetermined angle in the circumferential direction.

[0061] Two engaging portions 211 are formed on each first magnetic pole portion 210A. However, the number of engaging portions 211 formed on each first magnetic pole portion 210A may be one, three, four or more. In this embodiment, the engaging portions 211 are formed symmetrically on the radially inner side (direction of arrow d) of the first magnetic pole portion 210A, one on each side in the circumferential direction of the connecting portion with the plate-shaped portion 130. In the first magnetic pole portion 210A, the engaging portions 211 are arranged away from the connecting portion with the plate-shaped portion 130.

[0062] Similar to the engaging portion 121 of the ring 120, the engaging portion 211 is composed of a notch 211p, a protruding portion 211q, and a plate portion 211r. The notch 211p is a rectangular or approximately rectangular recess that is recessed radially outward (in the direction of arrow c). The notch 211p is formed in a shape whose circumferential dimension is larger than its radial dimension. However, the notch 211p may be formed in a shape whose circumferential dimension is smaller than its radial dimension. The protruding portion 211q is an approximately rectangular portion that protrudes and extends radially inward (in the direction of arrow d) from the end of the notch 211p on the radially outer side (in the direction of arrow c). In the circumferential direction, the protruding portion 211q is disposed at the center of the notch 211p. In the circumferential direction, the dimension of the protruding portion 211q is smaller than the dimension of the notch 211p. In the radial direction, the dimension of the protrusion 211q is smaller than the dimension of the notch 211p.

[0063] The plate portion 211r is a generally rectangular portion extending downward in the stacking direction (in the direction of arrow b) from the protruding portion 211q. In the circumferential direction, the dimension of the plate portion 211r is the same as or approximately the same as the dimension of the protruding portion 211q. Furthermore, in the circumferential direction, the dimension of the plate portion 211r is the same as or approximately the same as the dimension of the engaged portion 212. In the stacking direction, the dimension of the plate portion 211r is the same as or smaller than the thickness of the magnetic body adjacent to it on the lower side (in the direction of arrow b). Here, in this embodiment, since all the magnetic bodies (the first magnetic body 200a to the eleventh magnetic body 200k) have the same thickness, the dimension of the plate portion 211r in the stacking direction is the same as or smaller than the individual thicknesses of the first magnetic body 200a to the eleventh magnetic body 200k.

[0064] Each second magnetic pole portion 210B is formed with two rectangular or approximately rectangular engaged portions 212. However, the number of engaged portions 212 formed on each second magnetic pole portion 210B may be one, three, or four or more. The engaged portions 212 have the same shape, dimensions, and arrangement as the engaged portions 212a of the first magnetic body 200a.

[0065] The second magnetic body 200b has a first surface Su and a second surface Sd. The first surface Su is the surface on the upper side in the stacking direction (the direction of arrow a), and the second surface Sd is the surface on the lower side in the stacking direction (the direction of arrow b). In the second magnetic body 200b, the plate portion 211r of the engagement portion 211 extends and protrudes downward in the stacking direction (the direction of arrow b) beyond the second surface Sd.

[0066] The first magnetic body 200a and the second magnetic body 200b are stacked so that the first surface Sau of the first magnetic body 200a contacts the second surface Sd of the second magnetic body 200b. The first magnetic body 200a and the second magnetic body 200b are stacked so that all of the recesses 123a of the first magnetic body 200a are aligned with all of the recesses 123 of the second magnetic body 200b. At this time, in the stacking direction, the engaging portions 121 of the second magnetic body 200b overlap with the engaged portions 122a of the first magnetic body 200a, and the engaged portions 122 of the second magnetic body 200b overlap with the notches 121a of the first magnetic body 200a. Additionally, in the stacking direction, the engaging portion 211 of the second magnetic body 200b overlaps the engaged portion 212a of the first magnetic body 200a, and the engaged portion 212 of the second magnetic body 200b overlaps the notch 211a of the first magnetic body 200a. As a result, all of the engaging portions 121, 211 of the second magnetic body 200b engage with all of the engaged portions 122a, 212a of the first magnetic body 200a. The magnetic pole portion 210a and the plate-shaped portion 130a of the first magnetic body 200a overlap with the magnetic pole portion 210 and the plate-shaped portion 130 of the second magnetic body 200b, respectively, and form part of the teeth 201 of the core 200.

[0067] Thereafter, in the same manner, the third magnetic body 200c to the eleventh magnetic body 200k are sequentially stacked while being rotated by 60° around the axis X. Specifically, where n is an integer greater than or equal to 1, the magnetic bodies are stacked so that the engaging portions 121, 211 of the (n+1)th magnetic body, counting from the bottom in the stacking direction (the direction of arrow b), engage with the engaged portions 122, 212 (or engaged portions 122a, 212a) of the nth magnetic body (FIG. 10). As a result, all the magnetic bodies are integrated as the core 200 with their rotation around the axis X relative to each other restricted. The ring 120a of the first magnetic body 200a overlaps with the rings 120 of the second magnetic body 200b to the eleventh magnetic body 200k, forming the cylindrical portion 102 of the core 200. The magnetic pole portion 210a and the plate-shaped portion 130a of the first magnetic body 200a overlap with the magnetic pole portions 210 and the plate-shaped portions 130 of the second magnetic body 200b to the eleventh magnetic body 200k, forming teeth 201 of the core 200. The stator 2 is completed by winding an electric wire around each tooth 201 via an insulator to form a coil 10 (FIG. 9).

[0068] Like the core 100 of the stator 1 of the first embodiment, the core 200 of the stator 2 of this embodiment is less susceptible to stress distortion, is less susceptible to magnetic flux saturation due to obstruction of the magnetic path, is easy to manufacture, and can be stably mounted. Furthermore, when winding the electric wire to form the coil 10, the groove 123G can be used, for example, as a positioning portion to fix the jig.

[0069] Furthermore, the core 200 of the stator 2 according to this embodiment has an engaging portion and an engaged portion on the magnetic pole portion of the magnetic material in addition to the core 100 of the stator 1 according to the first embodiment, which allows for more secure fixation.

[0070] Although the stator of the present invention has been described above with reference to preferred embodiments, the stator of the present invention is not limited to the configurations of any of the above-described embodiments. The stator of the present invention may differ from the stator 1 according to the first embodiment and the stator 2 according to the second embodiment in the following respects, for example:

[0071] The stator of the present invention may be a stator for an inner rotor motor. In this case, the magnetic pole portions of each of the magnetic bodies constituting the core may be located radially inside the ring. Furthermore, the ring may have an engaging portion and an engaged portion on the outer periphery (radially outside) opposite the magnetic pole portions.

[0072] In the stator of the present invention, the ring of magnetic material may have an engaging portion and an engaged portion on the same side as the magnetic pole portion (the outer periphery in the case of an outer rotor type, and the inner periphery in the case of an inner rotor type). The ring of magnetic material may have an engaging portion and an engaged portion on both the inner periphery and the outer periphery. The engaging portion and the engaged portion may be provided on the radially outer side of the magnetic pole portion. Both the engaging portion and the engaged portion may be provided on each magnetic pole portion. Furthermore, the engaging portion and the engaged portion may be provided on a plate-shaped portion of the magnetic material.

[0073] In the stator of the present invention, the magnetic body may have a shape that matches when rotated (360 / m) degrees around the axis X, where m is an integer greater than or equal to 2 (i.e., an m-fold symmetric shape). In this case, the ring may have a plurality of engaging portions arranged side by side at intervals of (360 / m) degrees in the circumferential direction, and a plurality of engaged portions arranged side by side at intervals of (360 / m) degrees in the circumferential direction. In other words, m engaging portions may be arranged at predetermined intervals (equal intervals in this embodiment) in the circumferential direction, and an angle formed between two adjacent engaging portions may be (360 / m) degrees. Similarly, m engaged portions may be arranged at predetermined intervals (equal intervals in this embodiment) in the circumferential direction, and an angle formed between two adjacent engaged portions may be (360 / m) degrees. The engaging portions and engaged portions may be arranged alternately at intervals of (180 / m) degrees in the circumferential direction. For example, m may be 2, 3, 4, 5, 6, 7, 8, 9 or more.

[0074] In the stator of the present invention, the magnetic body may have any number of magnetic pole portions less than six, or any number of magnetic pole portions more than six.

[0075] In the stator of the present invention, the engaging portion of a magnetic body may engage with the engaged portions of two or more other magnetic bodies. In this case, the dimension of the engaging portion protruding in the stacking direction (i.e., the dimension of the plate portion in the stacking direction) may be greater than the thickness of the magnetic body. An example of this case is shown in FIG. 13. In the modification shown in FIG. 13, the engaged portions 322 of magnetic body 300b and magnetic body 300c overlap and engage with engaging portion 321 provided on ring 320 of magnetic body 300d. Engaging portion 321 is composed of notch 321p, protruding portion 321q, and plate portion 321r. Plate portion 321r is a substantially rectangular portion extending downward in the stacking direction from protruding portion 321q. In the stacking direction, the dimension of plate portion 321r (the dimension of the downward protrusion) is greater than the thickness of magnetic body 300c adjacent below and equal to or less than the combined thickness of the two magnetic bodies (magnetic bodies 300b and 300c) adjacent below. To achieve such a configuration, the number of engaged portions formed on the magnetic ring may be greater than the number of engaging portions (for example, in the example of Figure 13, the number of engaged portions 322 may be twice the number of engaging portions 321).

[0076] In the stator of the present invention, some or all of the multiple engagement portions of the magnetic bodies may extend upward in the stacking direction. In the stator of the present invention, the number of magnetic bodies constituting the core is arbitrary. The number of magnetic bodies may be, for example, 2 to 30, 3 to 25, 4 to 20, or 5 to 15.

[0077] In addition, those skilled in the art can appropriately modify the stator of the present invention and change the shape, dimensions, and combination of various components in accordance with conventionally known knowledge. As long as such modifications still include the components of the present invention, they are of course included in the scope of the present invention. [Explanation of symbols]

[0078] 1, 2…stopper, 100a~100k, 200a~200k, 300b~300d…magnetic body, 110, 110a, 210A, 210Aa, 210B, 210Ba…magnetic pole portion, 120, 120a, 320…ring, 130, 130a…plate-shaped portion, 121, 211, 321…fastening portion, 122, 122a, 212, 322…fastened portion.

Claims

1. A plurality of magnetic bodies are stacked in a predetermined direction, each of the plurality of magnetic bodies includes a plurality of magnetic pole portions arranged in a circumferential direction, a ring, and a plurality of plate-shaped portions connecting the plurality of magnetic pole portions and the ring; the ring includes an engaging portion extending in the predetermined direction and an engaged portion recessed in a radial direction, The engaging portion and the engaged portion are aligned in the circumferential direction, A stator, wherein, of the plurality of magnetic bodies, two magnetic bodies adjacent to each other in the predetermined direction have the engaging portion of one magnetic body engage with the engaged portion of the other magnetic body.

2. The stator according to claim 1 , wherein the engaging portion engages with the engaged portion of two or more magnetic bodies.

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